Do you mean the photo package where you buy 10/20 etc photos? As opposed to booking some kind of special photo shoot.
If just talking about the normal package, you don't get a special photographer who follows you around. Photo stations are set up most nights in various places and you go queue to get a photo. The photos are allocated to your cabin number.
On previous cruises I've done they also have photographers stationed outside the ship in port but not sure if they still do this. Also roaming photographers in the dining rooms.
If you book a dedicated photo shoot then I'm not sure how this works but I imagine you arrange a specific time and place with the photo team on board.